While building the aweseom http://www.thingiverse.com/thing:811271 I needed a way to attach my Arduino Mega 2560 r3 + Ramps, but no good bracket presented itself for some reason. The ones I could find had holes that didn't line up and/or were overly complicated. My sourceprinter also couldn't print it in one piece so I've split it in two and joined the pieces with a simple m3 8mm flat-headed screw and a single m3 nut. The 1-piece model without center-bracers is available here too. Update 1. september 2015: fixed some minor error. Added a vertical version of this over at: http://www.thingiverse.com/thing:993526I printed 0.2 layer height and 20% infill. Plenty strong. You can print either the 1-piece model, which doesn't have the connecting braces in the middle, or print the 2-pieces bracket. You need 2 plastic-zippers for the two top holes (see photos, on how to orient them) and 2 M3 8mm screws. I used hexagon socket screws. BOM 2x M3 8mm hexagon socket screws. 1x M3 8mm flat headed screw (for the 2-piece version) 2x plastic zippers. To fasten bracket: 2x M3 8-10mm screws.